Multiple-jet carbureter.



C. L. RAYHE LD. MULTIPLE JET CARB URET ER.

APPLICATION FILED SEPT.I. 19H.

Patented May 1, 1917; P

--s sums-sun n i 6. L-. RAYHELDf MULTIPLE JET CARBU RETER.

APPLICATIQN FILED SEPT. 1. IBM.

Patented May 1, 1911- f 5 SHEETSSNET 2.

c. L. RA-YFIELD. MULTIPLE JET CABBURETER. APPLICATION FILED SEPT-1,1911.

Patented May .1, 1917.

s'suzns-snsn' 5.

will! will -' yen- T CHARLES RAYFIELD, OF CHICAGO, ILLINOIS.

MULTIPLE-JET CABBURETER.

Specification of Letters Patent.

Patented May 1, 1917.

Application filed September 1, 1911. Serial No. 647,190.

To all whom it may concern:

Be it lmown that l, CHARLES L. 'Rarrnlnn, a citizen of the l uited States, and a resident of the city of Chicago, in. the county of Cook and State of Illinois, have invented certain. new and useful Improvements in l\:l ultiple- Jet C-arlnn'elers; and lilo hereby declare that the following is a full, clear, and ex. description of the same. reference being had to the accompanying drawings, and to the numbers of reference.marked thereon, which form a part of this specification.

This invention relates to improvements in carlnn'eters of that set forth in my prior application for patent for Carburet filed on the ,Sth day of Dmember, 1909, Serial No. 532,114, (Patent No. 1,193,820 of Aug-8, 191.6.)

The object of the inveutirm is to afford a multiple jet carburetor in which at least one of the jets is :mtonnitically controlled to vary the supply of fuel with the adjustment of the throttle.

It is also an object of the invention to afford a. construction of the class ch ibed in which an air inlet port or ports are provided for each jet, positioned to conduct the air across the jet when in. operation.

It is a further object of the invention to afford a construction in which a residual supply of gasolene or other hydi.'o-ca1'hon fuel, is maii'itained at all times in the path of the infiowing air, to assist in initial car buration, and to afford a large vaporizing area exposed to the intlowing air.

It is also an object of the invention to afford a construction adapted for ready ad'- justment to insure satisfactory control of the richness of the mixture under all conditions. The invention consists in the matters hereinafter described, and more fully pointed out and defined in the appended claims.

In the drawings: 7

Figure 1" is a side elevation. of a device embodying my invention.

Fig. 2 is a view in elevation of the opposite side of the carburetor.

Fig; 3 is a longitridinal vertical section with parts shown inelevation.

' Fig. 4 a section on line of Fig. 3. Fig. 5 is a section on line :1--5 of Fig. 3. Fig. 6 is a fragmentary section on, line 6-6 of Fig. 1, with parts omitted. Fig, 7 is a central section taken through the adjusting cam for one of; the jets.

Fig. 8 is a section on line 8-"8 of Fig. 2.

Fig. 9 is a fragmentary top plan View of the carburetor with parts omitted.

shown in the drawings:

Said carburetor comprises connected casings 'l and aliording a float feed chamber A, and a. mixing chamber 13. Said chambers, as shown, a re cylindrie. The casing 1, for the float teed chamber comprises cylindric side walls, and an integral bottom wall 3, having a. central or axial downwardly directed tubular boss 4, integral with the bottom. thereof, and Olllelllllg upwardly thereinto, and closed at its lower end by means of a screw plug 5, threaded thereinto, and engaging a suitable packingwashcr 6, between the same and the end of said boss to seal the same. i

The cover 7, for the float feed chamber, is removably secured thereto, and extending axially through said chamber, and a suitable central aperture in said cover, is a rod 8, of a lengthto extend into the bore in said boss 4:, as shown in Fig. 3, andto normally extend slightly above the cover. Adjustably (but rigidly) secured on said rod, is a float l), in the present instance shownas constructed of sheet metal, and having a sleeve 10, extending centrally tlierethrough, and through which the rod 8, extends. Said float teed chamber, is cored from the side adward extension G, of the chamber in the space between the same and said mixing chamber, and as shown, the casing of the mixing chamber B, is constructed to aiford a rearward extension 1), of the chamber, extending over said extension of the float feed (hai'nber C. and. to the wall of the float 'feed chamber, said chamber D constituting a carbureting chamber. R

The bottom. of said extension C, ofv the float feed chamber, is provided with an aperture thcrethrough, and threaded therein at itsupper end, is a cylindric plug 11, which serves to close the bottom of'that portion of the float feed chamber and 1s provided withfacentral upwardly opening recess or bore therein, connnumcatmg with a restr1cted central bore extending therethrough,

which affords the seat for the inlet needle valve, through which the flow of the hydro picent the mixing chamber, to afford an in carbon fuel into the float feed chamber is controlled. Said plug is provided omits.

lower end, with a peripheral downwardly extending internally threaded flange 12', and

threaded thereinto is a hollow connection 13,

no a

- closely.

As shown, packin washers 29, are pro- -.vided above and the extension G, from the float feed chamber forming the bottom of one and the top of the other is provided with an aperture there through, and threaded therein in alinement with the corresponding seat in the plug 11, is

the tubular nozzle or jet pipe 17, the upper' end of which extends above the floor 16, in said extension of the mixing chamber and the lower end of which extends below said partition 16. Slidably and loosely engaged thereon in the extension C, of the float feed chamber, is a sleeve 18, which, near its lower,

end, is restricted and tapered to a point to afford the valve closure 19, to seat within and to close the induction passage through .the plug 11. Said sleeve 18, is provided with apertures 18" therein slightly above the bottom of the float feed chamber, to admit the fluid from said float chamber thereinto, and a peripheral flange 20, is provided on said sleeve intermediate its ends, as shown in Fig. 3. A'Weak spring 21, is engaged around said sleeve and bears at its upper end on the wall 16, and at its lower end on said flange to hold'the lower needle valve normally closed when the float feed chamber is sufiiciently full to support the float.

Removably' secured in the float feed. chamber on the bottom thereof, is a projection 22, and pivotally engaged thereon is a lever 23, the shorter end of which is yoked to engage around the sleeve below the flange 20, and the longer end of which is provided with an aperture therethrough to receive therod 8. .As shown, a diametrically apertured ball 24, is rigidly-secured on said rod 8, and seats on said longer end of the lever 23, to afford a self-adjusting bearing for the float on said lever. f

Said plug 11, is provided with a passage 25, extending downwardly from its inner end to a passage 26, extending peripherally around the same, and a shallow cup 27, preferably metallic, and secured on the bottom of the mixing chamber by means of bolts, and spaced a distance therefrom, as hown in Figs. 1 to 3 inclusive, is provided with an integral arm or extension 28 having a bore therethrough, in which sai plug 11,"fits elow said .arm, and through which said v plug extendsto seal the joint therebetween, A passage 30, extends through said arm and communicates with f the peripheral passage. 26, of said plug,

Communicating with said passage and extending through said cup or saucer to near the middle of the mixing chamber, is a tubular jet nozzle 31. As shown, a cap screw 32,

is set in the under side of said saucer'or cup co-axially with said nozzle or jet, to afford access thereto for the purpose of cleaning or in assembling.

. Integral with the rear wall of the mixing chamber, or, in other words, directed toward.

the fioat'feed chamber, is a bracket or arm 33, having a cylindric seat in the under side thereof co-axial with the bore of the jet nozzle 17, and engaged therein at its upper end, and extending through the top Wall 34,

of the carbureting-chamber D, is a needle valve closure'35, for said jet nozzle 17. A spring 36, engaged in said seat in the arm '33, bears-on the upper end of said needle valve closure to hold the same normall seated. v I

'J'ournaled in 'a suitable bearing on the rear wall of the mixing chamber, is a transverse shaft 37, and secured thereon and projecting into a slot in theistem of the needle valve closure 35, is a finger 38, which vacts with the rotation of said shaft 37, to

manifold pipes leading to the engine. Ex-

tending through said mixing chamber are I parallel shafts 40-and 41,-above and below.

the carburetin g chamber D respectively, and rigidly but adjustal'ily secured thereon are butterfly valve closures 42 and 43, respectively. The upper butterfly valve closure 42, isslightly cut away on one'side thereof to aflorda suflicient passage for the mixture to the manifold pipes to support combustion 'whenthe throttle is substantially closed or at its lowest runnfii g' adjustment.

The lowerbutterfly valve ClOSilIB 43, is. slotted on its frontedge to receive the jet nozzle 31, therein, as shown in Fig. 3, when the valve is closed, and is also slotted at its opposite side and provided with a downwardly extending boss or projection. 44, to which is pivotally engaged the lower end of a rigid link or connecting rod 45, the

upper end of which is pivotal] y engaged on .a corresponding projection 46, on theupper is the throttle lever 47, whereby said shaft may be rotated, and said butterfly valves adusted.

Also rigidly secured thereon is a' rectangular block 48, at the inner side of the faces arranged approximately at right angles to each other, and the angle formed thereby cut away to afford a rounded continuation of the cam, as shown in Fi 7. A screw shaft 50, journaled in the ends of said cam block, is threaded through said block 48, and extending through a notch in the shaft 40, is provided on its outer end with an adjusting wheel 51, whereby the cam may be shifted on said block with reference to its center of rotation, towit, its shaft '40. One end of said screw shaft 50, is milled. and yiehlingly engaged in the ad justable cam block, is a spring pressed detent 52, adapted to engage the milled surface of the shaft to hold the same in adjusted position.

Loosely engaged on the shaft 37, for adjusting the needle valve closure 35. is a downwardlv and forwardly extending arm .33 provided at its" forward end with a hearing plate 54, removably secured thereon and engaging said movable cam member 49. and adapted by engagement therewith to actuate said lever and the shaft 37, to operate said needle valve. Integral with the arm 53. is a downwardly extending arm provided witha set screw 56, extending therethrough and rearwardly beyond the same.

Rigidly secured on said shaft 37. by means of a bracket arm 57, is a sleeve 59. "Tour.- iialed in said sleeve is a shaft 59. having rigidly secured on the lower end thereof a cam or eccentric (30, which bears against the reanvardly extended end of the set screw 56, to actuate the shaft 37. when the shaft 59, is rotated. Slight movement of the arm on the shaft 37, is atl'orded, so that rotation of the cam (50. against the adjusting screw, serves to swing the lower end of the I sleeve 58,. rearwardly. thereby elevating the finger 38, secured on said shaft. and slightly opening the needle. valve admitting to the carbnreting chamber D. A lever 61, is rig- -idl v secured on the upper end of the shaft 59, to rotate the same. and a rod 62., is pivolally secured to the extremity of said lever by means of a set screw (13, and extends rtairwardly through a suitable bracket 64, to permit of manual engagement to open saidneedle valve preparatory to starting the earburation.

Rigidly secured on the shaft 40, at the opposite side of the carbureter, is an arm 65, provided with a set screw 66 adapted to engage on a projection or lug 67, on the all of-the c osure. as shown in Fig. IOWII. a set screw (38, is employed for eng'ging said arm 65, on the shaft. Said setscr'ews 6 0 and (58. afford means for adjusting said arm to limit the degree .of closure of thehutterfly valves to the required amount to maintain a. sufficient sup. ply of the mixture to the motorto main"; tain the combustion at thelowest speed of the motor.

the closure 75, is increased thereby, while thereof. and a peripheral flange or tubular extension as), in the wall of the casing, is provided around said port. and extends out- 'wardly substantially liush with'the side walls of the casing. as shown in Fig. 4. and, as shown, the passage therethrougl-i tapers inwardly to conduct the air in a strong inflowing current or jet against the jet of the hydro-earlum as it conu's from the needle valve, thus spraying and thoroughly vaporizing the same and carrying the same therewith into the mixing chamber B. between the butterfly valves 42 and 43. As shown also, a slight elevation or rib 70, is provided on the floor of the earburetiug chamber. D at the point where the same communicates in the main mixing chamber, thereby scrvingto maintain a thin film of the hydro-carlmn fuel on the lloor of said mixing chamber extension to expose a large surface to vaporl'l illltlll.

An air inlet port is nlM) provided to deliver inllowing air to and across the top of the jet nozzle 31. For this purpose, as shown. a suitable aperture is provided in the wall of the mixing chamber and threaded thereinto' isa spider T1. at the hub of which is secured a shalt or stud '72, which extends outwardly therefrom and secured on which, and hearing against the hub of the spider. is a relatively strong spiral spring 73, coiled .oppositcly about which and on the outer side thereof. is a longer and weaker spiral spring Tl. Slidably engaged on said stud 72, is a valve disk 75. provided on its inner side with a hub 7a. adapted to engage the stronger inner spring T when unned inwardly sui iciently into an open position and normally held from engagement therewith and against its seat by the weaker spring 74, which enga 'es against said disk.

l lneaded upon the outwardly extending annular rim T7. of said spider, is a casing 78, ha ving an outwardly Haring nozzle 79, there-' on. as shown in 3, and affording an inner seat against which said disk '7 5, engages, as shown in Fig. 3, when the air valve is closed.

As shown. the periphery of said casing is longitudinally grooved on the outer side, and a spr-ing pressed detent 80, is engaged in a suitable bracket or arm 81, secured upon the wall of the mixing elnunber, and engages in said longitudinal grooves or -recesses tp hold said casing in adjusted posi ties; )f course, when the casing is adjusted inatrifly, the tension of the springs against outward adjustment decreases such pressure, thereby affording a larger supply of air for the; mixture.

As shown, a tubular casing or hood 82, closed at its upper end, is threaded upon a central boss 83, on the cover of the float feed chamber to exclude dust and dirt,

therefrom. Said boss, as shown, is also provided with a vent passage therethough from the float feed chamber to vent said chamber against internal pressure. Pivotover and into holding the rod 8, with the float thereon,

ing in part on the size of the carburete'r, the

, tion.

ally engaged in said hood, and extending through a slot in the side wall thereof, is

a bent lever, one arm 84,. of which-extends position to engage the rod 8, when the float feed chamber is'fillod to normal capacity. The other end 85, of said leyer, extends downwardly on the outer side of said hood, and is engaged .by a suitable rod to permit manual actuation, thereby with said rod 8, as shown in capacity required, and theoharacter .ofthe use for which intended.

The operation is as follows:.

The carbureter having been assembled and suitably connected with the manifold pipes or the engine, and with the fluid supply ply pipe from the tank, is adjusted to regulate the air supply through the automatic vahe 75,- and to regulate the inlet through d the needle valve nozzle 17, in the carburet ing chamber D. The adjustmenffor the needle valve 35, is effected by shifting the cam 49, relatively the shaft 40, b means of the screw-shaft 50, to vary the egreeof opening to the throttle requirements sothat I mixing chambers, are

opened in slightly the needle valve will be sufiiciently opened to maintain the'combustion at the lowest engine rate when the butterfly-valves in the approximately closed. A- wide range of adjustment is afi'orded by means of said cam, and practically any in; let requirements can be secured thereby, and when adjusted for the lowest engine. rate, a further degree of opening of the valve may .be secured by means of the cam 60, which 37, slightly in the' arm 55, aga nstwhlch said cam acts, thereserves to rotate the shaft by permitting the needle valve to-be further flooding the carbureter to begin the-carburation. f

This also is facilitated, by means of the tickler' lever on the, float feed chamber, whereby the float might be held,depressed tially closed, as well air inlet valve. The rear or inlet port, howthe needle valve 35, in the 86, is engaged on said lever upwardly out rate as required, the mixture As the throttle is mg chamber D. .An

' lym t s p 3 arranged and supported in utmost convenience for; assembling, adjustand the inlet needle valve 19, held open to ermit flooding of the float feed chamber;

of course, is. ad

he automatic air valve, justed, so that noi'mally, its closure is'out of engagement with the relatively strong inner coiledspring 73, and is held in c osed position by the lighter spring. spring, however, servesto resist the inward movement of said closure as it approaches the full requirement for the air supply for Said heavier the second inlet jet. By adjusting the 0115- 3 ing. for said-automatic valve inwardly or outwardly, substantially any air inlet requircrnents may be attained. a

The inlet jet in the mixing chamber, is normally 0 en at all times, and the e'xtremity thereo butterfly valves, said jet is practicall out of action when the engine is throttled low, owing to said butterfly valves being substanalso as the automatic ever, or that for chamber D remains in action, and a su effected thereby to maintain a low engine escaping therefrom to. the manifold pipes through the cient amount of carburation isbeing positioned between the notch orclearanc'e afiiorded in the rear edge of the upper butterfly valve closure, which is just above the mouth ofthe 'carbureti'ng chamber D when said butterfly valve is sub stantially closed.

'ondneedle jetis brought more fully into action, as well as the automatic valve, ow-

mg to the more rapid exhaustionjof the mix-'- ture from the mixingchamber. .I n consequence,'the automatic valve admits its quota of air which flows past, 'over and around the end ofsaid nozzle, thoroughly vaporizing and mixing with .the jet therefrom, and also mixing with ther'nixtu're from the carburety excess of gasolene or hydro-carbon. fuel 'fromthe jet 31 flows down intothdcup 27, below the lower open end of the i drawn inwardly over -the. same, rapidly'vw' porizes thesa'me; and carries it inwardly tomingle in the mixing chamber with that from" the two jets aforesaid, so that a large quanopened wider, the sec-- :chamber, and the air tity of mixture. is thereby;-.afiorded immedithe highest engine rate of combustion.

course, inasmuch as the inlet to the float feed chamber and the outlet therefrom to the carburetifig chamber D, are controlled each by a needle valve the arrangement whereby said needle va es are oo-axia'lly p1aoe,afi'ords the ment, inspection or repairfand exceedingly simplifies the' construction in allrespects.

It is to be understood, of come that details of the construction may be varied through a Wide degree. I have shown a preferred form of my invention, although numerous modifications and variations are, of course, possible. I therefore do not purpose limiting the patent granted, otherwise than necessitated by the. prior art.

I claim as my inveiftion:

l. A carburetor comprising a casing affording a mixing chamber, jet nozzles adapted to direct the hydro-carbon fluid thereinto, a throttle valve, means for regulating the inlet from one of the nozzles simultaneously and correspondingly with adjustment of the throttle valve, ports for admitting air into the mixing chamber across the discharge for the nozzles, an an tomatically operated normally closed air valve and a second air valve connected to the throttle valve so as to open said second air valve when the throttle is adjusted in excess of normal running position.

2. Acarbureter comprising a casing affox-ding a source of hydrocarbon supply and a mixing chamber, nozzles connected with said source of supply and adapted to direct the hydro-carbon fluid into the mixing chamber, a throttle valve, an adjustable cam for regulating the inlet from oneof the nozzles simultaneously with the adjustment of the throttle valve, a plurality of ports for admitting air into the mixing chamber, two of the same directing the inlet across the discharge for the hydro-carbon nozzle, a-mechanically operated normally closed air valve, and connections between said air valve and the throttle valve for opening said air .valve when the throttle valve is adjusted in excess of normal running position. l

3. In a carburetor a float chamber, a mixing chamber, a throttle valve controlling the How therefrom, a nozzle in open communication with said float chamber for spraying the hydro-carbon thereinto, and projecting into said mixing chamber, a nozzle and needle valve, therefor, a passage connecting said last mentioned needle valve to said float chamber, air inlet ports includingan automatic valved port, a butterfly valved port, and an open port, and connections between said butterfly valve of one port and said throttle valve for opening the former with opening movement of the latter. 4. In a carburetor of the class clescrlbed mixing chamber, means for discharging hycarbon fluid thereinto at a plurality of d fferent points at different levels and re moved from one another, a float valve controlling the flow of the fluid into the carbureter, a normally open air inlet communicating laterally at one side of said mixing chamber and fldjari t one'of said hydro; carbon inlet means uotlier automatically valved inlet communicating laterally in said mixing chamber opposite to said first menclosed auxiliary air valves, a cam actuated hydro-carbon needle valve,connections between one of said air valves and the throttle valve and the needle valve to cause said valves to open proportionately with the opening of the throttle, and a second-hydroca-rbon inlet operating independently of said valves.

6. In a carbureter, a mixing chamber, a

'cam actuated hydm-carbon inlet valve, an

auxiliary normally closed air valve opening into said mixing chamber, a spring actuated automatic air valve, a hydro-carbon inlet adjacent thereto, a throttle valve, and connections between said auxiliary air valve, the throttle valve, and'the hydro-carbon valve, to actuate the same to open said valves proportionately with the opening of the throttle.

7. In a carburetor of the class described, a fuel inlet, a mixing chamber, a normally open air inlet passage commun' ating laterally therein. another air inletcommunicat ing through the opposite side of said mixing chamber, and an air inlet in the bottom -of said mixing chamber, said second mentioned air inlet provided with an automatically acting valve and a manually operatable valve controlling the flow I through said third mentioned air inlet to the mixing chamber.

8. In a carbureter the combination with a casing affording a mixing chamber,.a plurality of hydrocarbon inlets adapted to admit fuel thereinto, a throttle valve controlling the flow of-fuel mixture therefrom, of a. plurality of air inlet ports, two thereof disposed opposite to one another and 60mnmnicating laterally in said mixing cham ber, thevone normally open and the other automatically controlled, and a thirdinlet port the opening and closing of which is governed directly by movement of the throt tle valve.

' 9. In a carburetor, the combination of a auxiliary mixing chamber, hydrocarbon inlets in each of said chambers, and air inlet ports adjacent each'of said hydro-carbon inlets.

10. In a carburetor the combination with a casing affording a Heat and mixing chamv and of constantarea of-opening at all times.

her, said mixing chamber having a normally open air inlet port, of a hydro-carbon nozzle and needle valve therefor disposed, in the path of air entering throughsaid port, a throttle valve in said mixing chamber con trolling the flow from the carbureter, a fuel nozzle communicating with saidfloat chainber'and projecting into'the mixing cham her at a point beneath said throttle valve, an

air inlet" valve controlling the admission of air into said mixing chamber and disposed below said fuel nozzle and connected with j said throttlevalve for simultaneous actuationtherewith, and an automatic air valve controlling another passage leading into said mixing chamber for the admission of air plurality of mixing chambers communicating with one another, hydro-carbon inlets in each thereof .one' oi-which is normally open, means controlling the flow of mixture ,from one of said mixing chambers simultaneously with the flow of hydro-carbon to the inlet in the other of said chambers,a'normally open air port .adjaoentfsaid' normally open hydro-carbon inlet, and a plurality of air ports adapted to admit air across thelother of said hydro-carbon'inlets.

l3.' In a multi-jet carbtireter a mixing chamber, a throttle valve controlling the outlet therefrom, an air valve at the bottom of the mixing chamber controlling theinlet of air directly to said mixing'chamberj and-operatively connected with said throttle valve, an automatic air valve connected'laterally in said mixing chamber, an inlet fuel valve, the area of opening of which changes throttle and air valves, anda fuel inlet com',

proportionately with the movement of! said municating directly in said mixing chamber 14. In a multi-jet carburetor a mixing chamber, a plurality of fuel inlets therefor, a throttle valve in said mixing chamber controlling the outlet therefrom, operative connections between said throttle valve and one of said fuel inlets to vary the area there through proportionately with. the opening or said throttle valve, said other fuel inlet of constant. area at all times, and a plurality .of air inlet ports, one normally open at all .area at all adjustments of said mixing chamber outlet valve, mechanism for changing the adjustment of the operative connections between said mixing chamber outlet valve and variable area fuel inlet to change the relative proportionate movements thereof, and air inlet ports disposed opposite one another and communicating laterally into the i mixing chamber, the one normally open and the other adapted to open due to suction within the mixing chamber.

16. In a carbui'eter, the combination with a casing formed into a float chamber, a mixing chamber, and a carbureting chamber, of

a hydro-carbon needle valve opening into 0 i said carbureting chamber, an air inlet port for said carbureting chamber, a throttle valve at the upper end of said mixing chain her, a feed nozzle projectinginto the lower end of said mixing chamber and communi 5 eating with said float chamber, an automatic horizontally-disposed 'air inlet valve positioned adjacent said fuel nozzle to admit air into the mixing chamber, and adjustable connections between the throttle valve and needle inlet valve.

17. The combination with a carbureter and its needle and throttle valves, of an air valve opening into the mixing chamber at the lower end thereof, a cam on said throttle valve adapted to actuate said needle valve, mechanical connections disposed within themixing chamber for actuating said air" valve in accordance with movements of the throttle valve, an automatic air inlet valve in the side of the mixing chamber, and an auxiliary fuel'nozzle within the mixing chamber adjacent said automatic air inlet valve. In testimony whereof I have hereunto V subscribed my name in the presence of two 1 11'5 subscribing witnesses.

' j CHARLES L. RAYFIELD. Witnesses:

Cannes W. HILLS, Jr., (honor B. MOORE. 

